U.S. patent application number 12/498818 was filed with the patent office on 2009-11-05 for base station, subordinated station and transmission method thereof.
This patent application is currently assigned to INSTITUTE FOR INFORMATION INDUSTRY. Invention is credited to Ming-Hsueh Chuang, Yih-Guang Jan, Wei-Chen Lee, Yang-Han Lee, Youn-Tai Lee, Yung-Ting Lee, Jheng-Yao Lin, Po-Jung Lin, Shiann-Tsong Sheu, Hsi-Chun Tseng, Hsien-Wei Tseng, Wei-Chieh Tseng, Ting-Chien Wang, Hua-Chiang Yin.
Application Number | 20090274111 12/498818 |
Document ID | / |
Family ID | 41257029 |
Filed Date | 2009-11-05 |
United States Patent
Application |
20090274111 |
Kind Code |
A1 |
Lee; Yang-Han ; et
al. |
November 5, 2009 |
BASE STATION, SUBORDINATED STATION AND TRANSMISSION METHOD
THEREOF
Abstract
A base station (BS), a subordinated station (SS) and the
transmission methods thereof for use in a multi-input multi-output
(MIMO) network are provided. The BS stores resource allocation
information about the MIMO network and an SS list, and generate a
super frame according to the resource allocation information and
the SS list. The super frame comprises a pilot pattern which
comprises a plurality of pilots and data. The BS and SS both
considers the pilot pattern as an identifier of the SS. When there
are communications occurred between the BS and the SS, the BS/SS
will confirm whether the pilot pattern of the super frame matches
the identifier of the SS to reduce interference from other stations
in the MIMO network.
Inventors: |
Lee; Yang-Han; (Zhongli
City, TW) ; Jan; Yih-Guang; (Taipei City, TW)
; Chuang; Ming-Hsueh; (Taipei City, TW) ; Tseng;
Hsien-Wei; (Fongshan City, TW) ; Lin; Jheng-Yao;
(Taipei City, TW) ; Lee; Wei-Chen; (Banciao City,
TW) ; Tseng; Wei-Chieh; (Taipei City, TW) ;
Tseng; Hsi-Chun; (Pingjhen City, TW) ; Wang;
Ting-Chien; (Taipei City, TW) ; Lin; Po-Jung;
(Jhonghe City, TW) ; Sheu; Shiann-Tsong; (Taipei,
TW) ; Lee; Yung-Ting; (Taipei, TW) ; Lee;
Youn-Tai; (Yung-Ho City, TW) ; Yin; Hua-Chiang;
(Taoyuan County, TW) |
Correspondence
Address: |
PATTERSON, THUENTE, SKAAR & CHRISTENSEN, P.A.
4800 IDS CENTER, 80 SOUTH 8TH STREET
MINNEAPOLIS
MN
55402-2100
US
|
Assignee: |
INSTITUTE FOR INFORMATION
INDUSTRY
Taipei
TW
|
Family ID: |
41257029 |
Appl. No.: |
12/498818 |
Filed: |
July 7, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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12435792 |
May 5, 2009 |
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12498818 |
|
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61050351 |
May 5, 2008 |
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61078666 |
Jul 7, 2008 |
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Current U.S.
Class: |
370/329 ;
375/267 |
Current CPC
Class: |
H04W 72/082 20130101;
H04L 5/0005 20130101; H04L 5/0051 20130101 |
Class at
Publication: |
370/329 ;
375/267 |
International
Class: |
H04W 72/04 20090101
H04W072/04 |
Claims
1. A base station (BS) for use in a multi-input multi-output (MIMO)
network, the MIMO network including another BS and a subordinated
station (SS), the SS being within a signal coverage between the BS
and the another BS, the another BS communicating with the SS by at
least one first pilot structure in a first super frame, the BS
comprising: a transceiver, being configured to receive the first
super frame; a storage module, being configured to store pilot
structure information; and a generation module, being configured to
select at least one second pilot structure of a second super frame
according to the pilot structure information and the at least one
first pilot structure of the first super frame to generate the
second super frame with the at least one second pilot structure;
wherein the at least one second pilot structure is orthogonal to
the at least one first pilot structure, the transceiver of the BS
may communicates with the SS by the second super frame with the at
least one second pilot structure to avoid a transmission
interference between the BS and the another BS.
2. The BS as claimed in claim 1, wherein the at least one second
pilot structure comprises a plurality of pilots, each of the pilots
comprises mitigation information so that the SS may further
overcome the transmission interference according to the mitigation
information.
3. The BS as claimed in claim 1, wherein the generation module is
further configured to generate an interference-reducing (IR) zone
in the second super frame, the IR zone comprises the at least one
second pilot structure.
4. A transmission method for use in a BS of an MIMO network, the BS
comprising a transceiver, a storage module and a generation module,
the storage module storing pilot structure information, the MIMO
network system including another BS and an SS, the SS being within
a signal coverage between the BS and the another BS, the another BS
communicating with the SS by at least one first pilot structure in
a first super frame, the transmission method comprising the
following steps of: (a) enabling the transceiver to receive the
first super frame; (b) enabling the generation module to select at
least one second pilot structure of a second super frame according
to the pilot structure information and the at least one first pilot
structure of the first super frame to generate the second super
frame with the at least one second pilot structure; and (c)
enabling the transceiver to communicate with the SS by the second
super frame with the at least one second pilot structure to avoid a
transmission interference between the BS and the another BS.
5. The transmission method as claimed in claim 4, wherein the ay
least one second pilot structure comprises a plurality of pilots,
each of the pilots comprises mitigation information so that the SS
may further overcome the transmission interference according to the
mitigation information.
6. The transmission method as claimed in claim 4, wherein the step
(b) comprising the following steps of: enabling the generation
module to generate the second super frame; enabling the generation
module to generate an IR zone in the second super frame; and
enabling the generation module to generate the at least one second
pilot structure in the IR zone of the second super frame.
Description
[0001] This application is a continuation-in-part application of
application Ser. No. 12/435,792 filed on May 5, 2009, which
application claims the benefit of priority based on U.S. Ser. No.
61/050,351 filed May 5, 2008, the disclosures of which are
incorporated herein by reference in their entirety. This
application also claims the benefit of priority based on U.S. Ser.
No. 61/078,666 filed on Jul. 7, 2008, the disclosure of which are
incorporated herein by reference in their entirety.
CROSS-REFERENCES TO RELATED APPLICATIONS
[0002] Not applicable.
BACKGROUND OF THE INVENTION
[0003] 1. Field of the Invention
[0004] The present invention relates to a base station, a
subordinated station and transmission methods thereof. More
specifically, the present invention relates to a base station, a
subordinated station and transmission methods thereof complying
with an IEEE 802.16m standard.
[0005] 2. Descriptions of the Related Art
[0006] With continuous advancement in science and technology,
people are imposing ever higher requirements on communications.
Nowadays, more and more importance is being attached to convenience
of communications in addition to requirements on quality of
communications. Wireless communications are advantageous in that
they provide higher mobility by obviating the need of physical
communication network wiring. Therefore,
wireless-communication-enabled products such as mobile phones,
notebook computers and the like are more and more popular in recent
years and have become the mainstream products in the consumer
electronics market.
[0007] In the conventional wireless networks, there are four kinds
of interference types in transmission: data transition in time
division duplex (TDD), data transition in frequency division duplex
(FDD), the interference in central zone edge, and the interference
in cell zone edge.
[0008] Particularly, please refer to FIG. 1A, which is a schematic
view of a transmission cell 1a in the conventional wireless
network. The transmission cell 1a comprises a plurality of central
zones 100, 104, 108, a plurality of cell edge zones 102, 106, 110,
a base station (BS) 111a, a plurality of subordinated station (SS)
103, 105, 107, 109, 111, 113, 115, 117 corresponding to the BS
101a. First, the interference of the data transition in TDD is
described. In the different central zones, if down link (DL) and up
link (UL) between the BS 101a and the SSs are operated at the same
time, the different SSs may have interference in the data
transmission.
[0009] The interference of the data transition in FDD occurs in
this situation that if the different SSs operate at the same
frequency, the SS may receive another SS's signal and get
interference. The interference in central zone edge means that if
the SS is positioned in the edge of the central zone, it may
receive the two kinds of signals from the two different central
zones, and one of the signals received by the SS is the
interference. For example, the SS 117 may receive the two kinds of
signals from the central zones 100 and 104, and one of the signals
received by the SS 117 is the interference. Similarly, the SSs 109
and 113 may meet the same interference as the SS 117, and will not
be described again.
[0010] The interference in cell zone edge means that if the SS is
positioned in cell zone edge and the BS's signal power is lower, it
may receive another BS's signal to make interference. For example,
the SS 107 is positioned in the edge of the cell zone and the BS's
101a signal power is lower, the SS 107 may receive another BS's
signal to make interference. Similarly, the SSs 111 and 115 may
meet the same interference as the SS 107, and will not be described
again.
[0011] Moreover, please refer to FIG. 1B, which is a schematic view
illustrating the transmission cell 1a and a transmission cell 1b in
the conventional wireless network. As shown in FIG. 1B, the SS 111
is within the signal coverage between the transmission cell 1a and
the transmission cell 1b. Specifically, the SS 111 is in a cell
zone edge of the transmission cell 1a and the transmission cell 1b,
and is communicating with the BS 101a of the transmission cell 1a
and a BS 101b of the transmission cell 1b at the same time, which
often occurs in a handover procedure. However, the SS 111 may
receive signals from the BS 101a and the BS 101b meantime, and the
interference occurs in cell zone edge accordingly to effect the
communication quality.
[0012] In summary, the aforementioned interference affects the
quality of communications between the BS and the SS in the wireless
network seriously. How to reduce the interference in the wireless
network efficiently is still an objective for the industry to
endeavor.
SUMMARY OF THE INVENTION
[0013] The primary objective of the present invention is to provide
a base station (BS) for use in a multi-input multi-output (MIMO)
network. The MIMO network includes another BS and a subordinated
station (SS). The SS is within a signal coverage between the BS and
the another BS. The another BS communicates with the SS by at least
one first pilot structure in a first super frame. The BS comprises
a transceiver, a storage module and a generation module. The
transceiver is configured to receive the first super frame. The
storage module is configured to store pilot structure information.
The generation module is configured to select at least one second
pilot structure of a second super frame according to the pilot
structure information and the at least one first pilot structure of
the first super frame to generate the second super frame with the
at least one second pilot structure. The at least one second pilot
structure is orthogonal to the at least one first pilot structure.
The transceiver of the BS may communicates with the SS by the
second super frame with the at least one second pilot structure to
avoid a transmission interference between the BS and the another
BS.
[0014] Another objective of the present invention is to provide a
transmission method for use in a BS of an MIMO network. The BS
comprises a transceiver, a storage module and a generation module.
The storage module stores pilot structure information. The MIMO
network system includes another BS and an SS. The SS is within a
signal coverage between the BS and the another BS. The another BS
communicates with the SS by at least one first pilot structure in a
first super frame. The transmission method comprises the following
steps: enabling the transceiver to receive the first super frame;
enabling the generation module to select at least one second pilot
structure of a second super frame with according to the pilot
structure information and the at least one first pilot structure of
the first super frame to generate the second super frame with the
at least one second pilot structure; and enabling the transceiver
to communicate with the SS by the second super frame with the at
least one second pilot structure to avoid a transmission
interference between the BS and the another BS.
[0015] The present invention uses different pilot structures, which
are orthogonal to each other, in the BSs to transmit the data to
the SS. These two different BSs may communicate with an SS in
different frequency/channel by using the different pilot structures
orthogonal to each other. The transmission interference, which
occurs when the SS is communicating with the different BSs at the
same time, may be reduced effectively. Thereby, the defects of the
conventional technique may be overcome effectively, and the quality
of communications may be enhanced obviously.
[0016] The detailed technology and preferred embodiments
implemented for the subject invention are described in the
following paragraphs accompanying the appended drawings for people
skilled in this field to well appreciate the features of the
claimed invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1a illustrates a transmission cell 1a in the
conventional wireless network;
[0018] FIG. 1b illustrates the transmission cell 1a and a
transmission cell 1b in the conventional wireless network;
[0019] FIG. 2 illustrates a first embodiment of the present
invention;
[0020] FIG. 3 illustrates the super frame of the first
embodiment;
[0021] FIG. 4A illustrates a configuration of the pilot pattern of
the first embodiment;
[0022] FIGS. 4B-4I illustrate variations of the configuration of
the pilot pattern of the first embodiment;
[0023] FIG. 5A illustrates another configuration of the pilot
pattern of the first embodiment;
[0024] FIGS. 5B-5D illustrate variations of the another
configuration of the pilot pattern of the first embodiment;
[0025] FIGS. 6A-6B illustrate a second embodiment of the present
invention;
[0026] FIG. 7 illustrates a third embodiment of the present
invention;
[0027] FIG. 8 illustrates the pilot structures of the first
embodiment; and
[0028] FIG. 9 illustrates a fourth embodiment of the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0029] In the following description, the present invention will be
explained with reference to embodiments thereof. However, these
embodiments are not intended to limit the present invention to any
specific environment, applications or particular implementations
described in these embodiments. Therefore, descriptions of these
embodiments are only intended to illustrate rather than to limit
the present invention. It should be appreciated that, in the
following embodiments and the attached drawings, elements not
related directly to the present invention are omitted from
illustration; and dimensional relationships among individual
elements in the attached drawings are illustrated only for ease of
understanding, but not to limit the actual scale.
[0030] A first embodiment of the present invention is shown in FIG.
2, which is a schematic view of an MIMO network 2. The MIMO network
2 comprises a BS 21 and an SS 23. The SS 23 is within a signal
coverage of the BS 21. It should be noted that, in this embodiment,
the MIMO network 2 just comprises the BS 21 and the SS 23 for
description convenience. In other embodiment, the MIMO network 2
may further comprise other BSs and SSs, the operations and
functions thereof are similar to those of the BS 21 and the SS 23.
Peoples skilled in the art can understand easily according to the
description in this embodiment.
[0031] First, the downlink (DL) transmission between the BS 21 and
the SS 23 is described. The BS 21 comprises a storage module 211, a
generation module 213 and a transceiver 215. The storage module 211
is configured to store resource allocation information 210 about
the MIMO network 2 and an SS list 212. The resource allocation
information 210 is used to records how the resource of the MIMO
network 2 allocates currently. The SS list 212 is used to record
the basic information, such as the identifier (ID), of all SSs
(including the SS 23) in the MIMO network 2.
[0032] To transmitting DL data to the SS 23, the generation module
213 of the BS 21 is configured to generate a super frame 214
corresponding to the SS 23 according to the resource allocation
information 210 and the SS list 212. The super frame 214 being
generated by the generation module 213 comprises an
interference-reducing (IR) zone. The IR zone comprises a pilot
pattern.
[0033] For more details, please refer to FIG. 3, which is a
schematic view of the super frame 214. In FIG. 3, FH represents
"Frame Header", F0-F3 represent "Frames 0-3" respectively, SFM
represents "Sub-Frame Map", DLSF0-DLSF4 represent "DownLink
Sub-Frames 0-4" respectively, IRR represents "Interference Reducing
Request" and ULSF5-ULSF7 represent "UpLink Sub-Frames 5-7"
respectively. The super frame 214 further comprises switch points
214a and 214b. In the following description, only differences from
the conventional techniques will be described, and the portions of
the super frame 214 identical with those of the conventional
techniques are omitted from description herein and understood by
peoples skilled in the art easily.
[0034] To reducing or avoiding interference of the data
transmission, the present invention provides the IR zone (i.e.
frame F1) in the super frame 214. The IR zone of the super frame
214 comprises a pilot pattern 216 which is arranged as an
identifier of the SS 23. The pilot pattern comprises a plurality of
pilots and data, where each pilot comprises mitigation information,
the functions of which will be described later. The configuration
of the pilot pattern may be presented as shown in FIG. 4A. In FIG.
4A, the horizontal axis represents "symbol", the vertical axis
represents "subcarrier", the gray grid represents a pilot and the
white grid represents data. In this embodiment, since each of the
BS 21 and the SS 23 uses two antennas to communicate, the
configuration of the pilot pattern will be simplified as shown in
FIGS. 4B-4I which just illustrates the pilot parts of FIG. 4A.
[0035] For example, FIG. 4B illustrates eight possible pilot
patterns, each of which has six pilot structures. Since the each of
the BS 21 and the SS 23 uses two antennas to communicate, each
pilot structure has two pilots (FIG. 4B shows them in nonwhite
grid). Each pilot pattern in FIG. 4B can be considered as an
identifier of the SS 23. In other words, the pilot patterns in FIG.
4B can be identifiers of eight SSs respectively. Similarly, each of
the pilot patterns in FIGS. 4B-4I can be an identifier of an
SS.
[0036] Please refer to FIG. 5A, which shows another configuration
of the pilot pattern. In FIG. 5A, the horizontal axis represents
"symbol", the vertical axis represents "subcarrier", the gray grid
represents a pilot and the white grid represents data. The
configuration of the pilot pattern will also be simplified as shown
in FIGS. 5B-5D which just illustrates the pilot parts of FIG. 5A.
Similarly, each of the pilot patterns in FIGS. 5B-5D can be an
identifier of an SS.
[0037] After the generation module 213 of the BS 21 generates the
super frame 214, the transceiver 215 configured to transmit the DL
data to the SS 23 by the super frame 214 so that the SS 23 may
receive the DL data after confirming the pilot pattern of the super
frame 214 matches the identifier of the SS 23. Particularly, the SS
23 comprises a transceiver 231 and a confirmation module 233. The
transceiver 231 of the SS 23 is configured to receive the pilot
pattern 216 of the super frame 214. Then the confirmation module
233 is configured to confirm whether the pilot pattern 216 of the
super frame 214 matches the identifier of the SS 23 and then
generate a confirmation result 230.
[0038] If the confirmation result 230 indicates the pilot pattern
216 of the super frame 214 matches the identifier of the SS 23, the
transceiver 231 is further configured to receive the DL data
according to the confirmation result 230. In addition, since each
of pilots in the pilot pattern 216 comprises the mitigation
information, the transceiver 231 is further configured to overcome
a transmission interference of the DL data according to the
mitigation information after receiving the DL data.
[0039] Now the uplink (UL) transmission between the BS 21 and the
SS 23 is described. The transceiver 231 of the SS 23 is further
configured to transmit a UL data to the BS 21 by the super frame
214. Similar to the DL transmission between the BS 21 and the SS
23, the transceiver 215 of the BS 21 is configured to receive the
pilot pattern 216 of the super frame 214 and confirm whether the
pilot pattern 216 of the super frame 214 matches the ID of the SS
23. If so, the transceiver 215 of the BS 21 will receive the UL
data and further overcome the transmission interference of the UL
data according to the mitigation information after receiving the UL
data.
[0040] A second embodiment of the present invention is shown in
FIGS. 6A-6B, which is a flow chart of a transmission method for use
in the MIMO network 2 of the first embodiment. First, step 300 is
executed to generate a super frame corresponding to the SS 23
according to the resource allocation information and the SS list.
The super frame comprises a pilot pattern being arranged as an
identifier of the SS 23. Step 301 is executed to generate an IR
zone in the super frame, where the IR zone comprises the pilot
pattern. Step 302 is executed to transmit DL data to the SS 23 by
the super frame.
[0041] Then step 303 is executed to receive the pilot pattern of
the super frame. Step 304 is executed to confirm whether the pilot
pattern of the super frame matches the identifier of the SS 23 and
generates a confirmation result. If the confirmation result is
negative, step 305 is executed to stop receiving the DL data. If
the confirmation result is positive, step 306 is executed to
receive the DL data according to the confirmation result. Since the
pilot pattern comprises a plurality of pilots, each of which
comprises mitigation information, step 307 is executed to overcome
a transmission interference of the DL data according to the
mitigation information after receiving the DL data.
[0042] Step 308 is executed to transmitting a UL data to the BS 21
by the super frame. Step 309 is executed to receive the UL data
after confirming the pilot pattern of the super frame matches the
identifier of the SS 23. Finally, step 310 is executed to overcome
a transmission interference of the UL data according to the
mitigation information after receiving the UL data.
[0043] In addition to the steps shown in FIGS. 6A and 6B, this
embodiment can also execute all the operations and functions of the
above embodiments. Those of ordinary skill in the art will readily
know how to execute the corresponding operations and functions in
this embodiment by considering those in the first embodiment;
therefore, a detailed description will be omitted here.
[0044] The method described above may be embodied in a computer
readable medium storing the previously described computer program
to execute the above steps. The computer readable medium may be a
soft disk, a hard disk, a compact disk, a mobile disk, a magnetic
tape, a database accessible via a network, or any storage medium
that is known to those skilled in the art to have similar
functions.
[0045] A third embodiment of the present invention is shown in FIG.
7, which is a schematic view of an MIMO network 7. The MIMO network
7 comprises a BS (i.e. the BS 71 in FIG. 7), another BS (i.e. BS 72
in FIG. 7) and a SS 73. The BS 71 comprises a storage module 711, a
generation module 713 and a transceiver 715. The storage module 711
is configured to store pilot structure information 714 recording
the information about the pilot structures of the BS 71 and the BS
72. The SS 73 is within a signal coverage between the BS 71 and the
BS 72.
[0046] For the convenience of following description, it is assumed
that the SS 73 is communicating with the BS 71 and the BS 72 at the
same time for a handover procedure. In other embodiments, the SS 73
may communicate with BSs 71, 72 at the same time in different
procedures. People skilled in the art may understand it according
to the description in this embodiment.
[0047] Based on the above assumption, the SS 73 is handovering from
the BS 72 to the BS 71. Before starting the handover procedure, the
BS 72 is communicating with the SS 73 by at least one first pilot
structure in a first super frame 724. After starting the handover
procedure, the SS 73 has to communicate with the BS 71 and the BS
72 simultaneously. In order to avoid the transmission interference
while the SS 73 is communicating with the BS 71 and the BS 72, the
transceiver 715 of the BS 71 is configured to receive the first
super frame 724 to know the at least one first pilot structure.
[0048] The generation module 713 is configure to select at least
one second pilot structure of a second super frame 714 according to
the pilot structure information 712 and the at least one first
pilot structure of the first super frame 724 to generate the second
super frame 714 with the at least one second pilot structure,
wherein the at least one second pilot structure is orthogonal to
the at least one first pilot structure. After generating the second
super frame 714, the transceiver 715 of the BS 71 may communicates
with the SS 73 by the second super frame 714 avoid a transmission
interference between the BS 71 and the BS 72.
[0049] More particularly, please refer to FIG. 8 together. As
described in aforementioned embodiments, the first super frame 724
may comprise a pilot pattern like the one shown in FIG. 4A. The
pilot pattern comprised in the first super frame 724 may be divided
into three sub-channels 751-753 in frequency. Each of sub-channels
751-753 may comprise a first pilot structure, i.e. first pilot
structure 7241, first pilot structure 7242 and first pilot
structure 7243. Each first pilot structure may comprise a plurality
of pilots (such as the gray grids and the stripe grids of FIG. 8),
each of which comprises mitigation information so that the SS 73
may overcome the transmission interference according to the
mitigation information. Similar to the first super frame 724, the
second super frame 714 comprises second pilot structures
7141-7143.
[0050] In addition, as shown in FIG. 8, the second pilot structure
7141 is orthogonal to the first pilot structure 7241 to avoid the
transmission interference. The pilot structure information 712 of
the storage module 711 is to record the corresponding relation of
the first pilot structures 7241-7243 and the second pilot
structures 7141-7143 as shown in FIG. 8. Hence, after the
transceiver 715 receives the first super frame 724, the generation
module 713 may know the at least one first pilot structure of the
first super frame 724 is like the first pilot structure 7241, and
then select the at least one second pilot structure of the second
super frame 714, which is like the second pilot structure 7141,
according to the pilot structure information 712 and the first
pilot structure 7241.
[0051] Herein, the transceiver 715 of the BS 71 may communicates
with the SS 73 by the second super frame 714 with the at least one
second pilot structure (i.e. second pilot structure 7141) to avoid
the transmission interference between the BS 71 and the BS 73. In
addition, the generation module 713 is further configured to
generate an interference-reducing (IR) zone in the second super
frame 714, and the IR zone comprises the at least one second pilot
structure. The IR zone is explained in aforementioned embodiments
and not described again.
[0052] A fourth embodiment of the present invention is shown in
FIGS. 9A-9B, which is a flow chart of a transmission method for use
in a BS of a MIMO network, such as the BS 71 of the MIMO network 7
in the third embodiment. The BS comprises a transceiver, a storage
module and a generation module. The storage module stores pilot
structure information. The MIMO network system includes another BS
and an SS. The SS is within a signal coverage between the BS and
the another BS. The another BS communicates with the SS by at least
one first pilot structure in a first super frame.
[0053] The transmission method of this embodiment comprises the
following steps. First, step 901 is executed to enable the
transceiver to receive the first super frame. Step 902 is executed
to enable the generation module to generate the second super frame.
Step 903 is executed to enable the generation module to generate an
IR zone in the second super frame. Step 904 is executed to enable
the generation module to generate the at least one second pilot
structure in the IR zone of the second super frame.
[0054] The steps 902-904 may be considered as a step of enabling
the generation module to select at least one second pilot structure
of a second super frame according to the pilot structure
information and the at least one first pilot structure of the first
super frame to generate the second super frame with the at least
one second pilot structure. Finally, step 905 is executed to enable
the transceiver to communicate with the SS by the second super
frame with the at least one second pilot structure to avoid a
transmission interference between the BS and the another BS. In
addition, the at least one second pilot structure comprises a
plurality of pilots, each of which comprises mitigation information
so that the SS may further overcome the transmission interference
according to the mitigation information.
[0055] In addition to the steps shown in FIG. 9, this embodiment
can also execute all the operations and functions of the third
embodiment. Those of ordinary skill in the art will readily know
how to execute the corresponding operations and functions in this
embodiment by considering those in the third embodiment; therefore,
a detailed description will be omitted here.
[0056] The method described above may be embodied in a computer
readable medium storing the previously described computer program
to execute the above steps. The computer readable medium may be a
soft disk, a hard disk, a compact disk, a mobile disk, a magnetic
tape, a database accessible via a network, or any storage medium
that is known to those skilled in the art to have similar
functions.
[0057] The present invention arranges a pilot pattern, which
comprises a plurality of pilots, of the super frame as an
identifier of an SS. No matter data transition in the TDD, FDD, the
central zone edge or the cell zone edge, the BS and the SS will
confirm whether the pilot pattern of the super frame matches the
identifier of the SS which the BS/SS attempts to communicate with.
If the confirmation result is positive, the communication will be
proceeded. If the confirmation result is negative, the
communication will be terminated. By confirming the pilot pattern,
interference of transmission in the MIMO network will be reduced
effectively, and the quality of communications will be enhanced
effectively.
[0058] Furthermore, the present invention uses different pilot
structures, which are orthogonal to each other, in the BSs to
transmit the data to the SS. These two different BSs may
communicate with an SS in different frequency/channel by using the
different pilot structures orthogonal to each other. The
transmission interference, which occurs when the SS is
communicating with the different BSs at the same time, may be
reduced effectively. Thereby, the defects of the conventional
technique may be overcome effectively, and the quality of
communications may be enhanced obviously.
[0059] The above disclosure is related to the detailed technical
contents and inventive features thereof. People skilled in this
field may proceed with a variety of modifications and replacements
based on the disclosures and suggestions of the invention as
described without departing from the characteristics thereof.
Nevertheless, although such modifications and replacements are not
fully disclosed in the above descriptions, they have substantially
been covered in the following claims as appended.
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